6 Questions
What is the standard length of an International Nautical Mile?
1852 m
What is the abbreviation for a Knot?
kn
What is the length of a Cable?
182.88 m
What is the length of a Sea Mile at the Equator?
1842.9 m
What is the mean value of the Sea Mile at 45˚ Latitude?
1852.2 m
What does the symbol 'M' represent?
Sea Mile
Study Notes
Units of Measurement in Navigation
- The International Nautical Mile is a standard fixed length of 1852 meters, abbreviated as "n mile" or "nm".
- A Cable is a unit of length, equal to one-tenth of a Sea Mile, approximating to 182.88 meters.
- The Knot is a fixed unit for measuring speed, equal to one International Nautical Mile (1852 meters) per hour, abbreviated as "kn".
Characteristics of the Sea Mile
- The Sea Mile is the length of one minute of arc (1') measured along the Meridian in the Latitude of the position.
- On Admiralty charts on the Mercator projection, Latitude graduations form a Scale of Sea Mile, represented by the symbol 'M'.
- The length of the Sea Mile varies with Latitude, being shortest at the Equator (1842.9 meters) and longest at the Poles (1861.6 meters).
- The mean value of the Sea Mile is approximately 1852.2 meters at 45° Latitude (at WGS 84).
This quiz covers key concepts in coastal navigation, including definitions of international nautical mile, cable, and knot. Students of navigation can test their knowledge here.
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